ok, so i’m glad to know that is a rule, because i didn’t know it. it’s weird how rules like the bomb in the water in de_inferno are shown at the beggining of the connection to the server, and “important” and “wide-known” rules like this aren’t.
anyway thanks a lot for the answer 
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and about the ban, i’m afraid because now i have to be careful to do not make too many headshots or i’ll be banned again… F…!!!!, i’m sorry but that’s unpleasant.